Why do they state that Neopan 1600 comes in 120? I have never been able to find any.
And what's the deal with reciprocity failure? Me no understand the concept.
The film loses sensitivity.
When you need to expose for let's say 1 second, a given film will start to lose its sensitivity so you will have to expose for 2 seconds instead (overexpose) in order to give the film a chance.
Anything shorter then 1/1000 and longer the 1 second will require overexposure for getting a correctly exposed film. That's not bad really... But once you're hitting the 5 minutes exposure reading, then you'll have to bracket anywhere from 10 minutes to 1 hour...
There is no reciprocity failure with digital.